- Geological Survey (U.S.) (65)
- Roeser, C. (Charles) (33)
- Bien, Julius, 1826-1909 (32)
- Berthrong, I. P (26)
- United States. General Land Office (22)
- Dinsmore, A. F (19)
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- Geographia Ltd (14)
- Hendges, M (14)
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